I have a data frame (attached) that has interpolated EOT errors for
each minute before flight landing. It also has the runway and an index
for the flight:
> > times[1:4,]
time error runway flight
1 0 -0.02206235 04R 1
2 1 -0.07961631 04R 1
3 2 -0.13795380 04R 1
4 3 -0.20726073 04R 1
> > sapply(times, class)
time error runway flight
"numeric" "numeric" "factor" "factor"
I want to plot this using ggplot2
library(ggplot2)
pp2 = qplot(times$time, times$error, times)
pp2 = pp2 + facet_wrap(~ times$runway)
print(pp2)
But when I try it, I get the error
Error in fix.by(by.x, x) : 'by' must specify valid column(s)
I get the same error if I make times$time a factor:
> > times$time = as.factor(times$time)
> > sapply(times, class)
time error runway flight
"factor" "numeric" "factor" "factor"
> > pp2 = qplot(times$time, times$error, times)
> > pp2 = pp2 + facet_wrap(~ times$runway)
> > print(pp2)
Error in fix.by(by.x, x) : 'by' must specify valid column(s)
What am I doing wrong?
And I really want to make a boxplot for every minute of times$time, but
when I try that, I get one single box.
Thanks for the help,
Jim
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